Polishing-wheel.



L. J. DOUGLASS.

POLISHING WHEEL.

APPLICATION FlLED JAN. 17, mm.

' 1,1 99,742. Patented Sept. 26,1916.

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LEWIS J. DOUGLASS, OF I'IARDVVTGK, VERMONT, AS-SIGIN'OR TO M. HEIGHT & SON

COMEANY, F PUTNAMVILLE, VERMONT, A FIRM.

POLISHING-VJ HEEL.

Specification of Letters Patent.

Patented Sept. 26, 1916.

. Application filed January 17, 1916. Serial No. 72,470.

To all whom it may concern:

Be it known that I, Lnwrs J. Doocmss, a citizen of the United States, residing at Hardwick, in the county of Caledonia and State of Vermont, have invented certain new and useful Improvements in Polishing- Wheels, of which the following is a specification.

The invention has for an object to effect an improvement in the action of polishing wheels of that type in which aribbed plate of circular form is provided. with scroll flanges on the side next the work, between which an abrasive is introduced which is moved about by the flanges and borne thereby against the work. I am familiar with various forms of such wheels in which,

in addition to the scroll flanges used to draw the abrasive material inward from ad jacent the edges of the wheel, other flanges are provided inwardly thereof having effect different in degree, and in my copending application filed August 21, 1915, Serial 46,694, allowed Nov; 8, 1915, I have shown inner flanges having the eflect of producing alternate inward and outward movements of the abrasive in the intermediate area of the wheel. It is the particular aim of this invention to secure a further improvement in the same direction as my above mentioned device, wherein the polishing action attained is further increased. I accomplish this with a minimum number of flange elements, which is a distinct advantage, in reducing the quantity of material to be used, minimizing the weight of the wheel, reducing frictional resistance to the driving of the wheel.

My present invention retains the advantages of wheels in which the abrasive is moved toward the center of the wheel, but at the same time maintains a certain amount of the abrasive in the outer parts of the wheel, so that there is no excessive accumulation at the center or near it. There is also a great degree of abrasive action produced in the central part of the wheel.

Additional objects and advantages will appear from the following description and in the drawings, where- Figure 1 is a bottom view of a wheel constructed in accordance with my invention, Fig. 2 is a sectional view thereof on the line 22 of Fig. 1, Fig. 3 is a fragmentary plan of one of the possible embodiments of the invention, Fig. 4 is a sectional view on the line 4-4 of Fig. 3.

There is illustrated a wheel comprising the back plate 10 of circular form having on the upper side any suitable means for connecting -it to a driving shaft. On its under side there are shown integrally formed ribs or flanges of peculiar form and relation, as will be particularly pointed out. These flanges may of course be formed separately and attached if desired, this being a familiar practice.

Radiating from the center of the plate there are four rectilinear flanges 11, and on opposite sides of the center there are two groups of flanges 12, 13, and 14, of right angular form, nested in parallel relation and suitably spaced to provide-channels 15 and 16 therebetween. The junctions of the end portions of the flanges 12, 13, and 14 are rounded as at Y17, and are disposed intermediately between two adjacent flanges 11. The outermost flange, 14, at each side, has its end portions extended across the extremities of the flanges 11 thereadjacent, and extended therebeyond a distance, more at one end than at the other, so that the ends of one set of the flanges 12, 13 14, do not come into close proximity with adjacent ends of the opposite set of flanges.

The wheel is provided also with two scroll flange portions 18, starting at. the periphery of the plate adjacent the long ends of respective groups of the flanges 12, 13, 14, converging very gradually toward the center of the plate to a point adjacent a line from the center of the plate through the bends 17 in the flanges 12, 13, 14, whence they continue with increased convergence toward the center until they meet the long ends of the flanges 12the innermost of the opposed groups of which they form parts. In reaching this junction with the flanges 12, the scroll flanges pass close to. the short ends of the opposed group, which are sufliciently shortened to leave a clear way between themselves and the scroll flanges, serving as achannel for the free passage of material engaged and moving inward by the action of the scroll flanges. Between the outer and long ends of the flanges 14 and the adjacent outer ends of the scroll flanges there is a considerable space, in which there is located a curved flange 20, eccentric and slight y con ergent to the axis of the plate. 119

It will be seen that each scroll flange has its outer end or beginning located near the junction of the other scroll flange with the flange 12, and the long ends of the flanges 13 and 1 1 are located in the throat passage therebetween. These ends of the flanges 13 and 14 may be curved and extended slightly in this throat passage a short distance, either more or less than as shown;

If desired the flanges 11 may be made much thinner where they extend between the flanges 12, 13, 1e, than at their inner parts, as indicated in Figs. 3 and .L at 11, or they may be formed of softer material than the other flan esat these parts.

In use, the wheel being rotated in the direction in which the outer ends of the flanges 18 point, the abrasive material is caught by these flanges and also by the ends of the flanges 12 and 13 and that which does not work under these flanges is carriedinward and slips along the channels between the flanges toward their inner parts. That material engaged by the scroll flanges is carried inward, and passes without obstruction, into the rectangular space 22 between adjacent ends of opposed flanges 12 and two of the flanges 11. tends to pass along the channels between the flanges 12, 13, 14, however, is checked by the flanges 11 or their continuations, and therefore a quantity of abrasive is accumulated before these flanges 11 in the outer parts of the wheel and caused to feed more positively under the adjacent flanges than would be the case if it were allowed free passage through the channels at these points. At the same time the surplus is available in case clear spots are encountered, and that part held before the flanges 11 or 11 between the ones 12, 13, 14, will be available much sooner in su'ch'a case, than where all material is allowed to pass unobstructedly to the center or inner parts of the wheel. The scroll flanges being outward of the terminations of the flanges 11, excess material passing under the flange let will be engaged by the scroll flange and That material which passed toward the center of the wheel. ln wardly of the flanges 11, the long ends of the flanges 12, 13, 141 tend to work outwardly on the abrasive material and the following short end portions of the latter flanges nects and moved into the center pocket.

In the central part of the wheel, where centrifugal effect on the abrasive is least manifest, the angle of incidence between stationary particles and approaching flanges 11 is at the maximum and a very efficient grinding action is performedin this part 'of the wheel, while the surplus over that required for the whole wheel is efliciently retained.

What is claimed:

1. A polishing wheel comprising a plate having a plurality of flanges, certain of the flanges being of scroll form leading from the outer part of the plate toward the'center, and a plurality of flanges radiating from the center of the plate and stopping short of the outer part of the plate and inwardly of said certain scroll flanges.

2. A polishing wheel comprising a plate having a plurality of flanges, including an outer scroll flange part and an inner scroll flange part so arranged relatively as to form a throat passage opening toward the edge of the plate, certain otherflanges on the plate being arranged with their extremities presented outwardly in this passage and spaced apart to form channels leading inwardly on the plate, and flange elements extending across these channels and joined to the flanges on each side.

In testimony whereof I affix my signature in presence of two witnesses.

LEWIS J. DOUGLASS. Witnesses:

OSCAR L. SHEPARD, ALPHONSUS J. MURPHY,

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

